CN103364670B - Bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test - Google Patents
Bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test Download PDFInfo
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Abstract
The invention discloses a kind of bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test, the cooperation control logic high and low end bivalve group change of current being become to shunting switch is increased in pole control system, be specially: between low end valve group group control system communicates with the control bus of pole control system, increase a binary, this binary is " it is controlled that the low side change of current becomes shunting switch " signal, delivers to pole control system by low end valve group group control system; Two binary are increased between high end valve group group control system communicates with the control bus of pole control system, be respectively " it is controlled that the high-end change of current becomes shunting switch " signal, pole control system is delivered to by high end valve group group control system, another signal is " allowing the high end valve group change of current to become shunting switch adjustment during OLT test " signal, is issued to high end valve group group control system by pole control system.Adopt the present invention effectively can solve in no-load applied voltage test process the problem occurring high and low end valve group Voltage unbalance.
Description
Technical field
The present invention relates to extra-high voltage direct-current transmission field, in particular a kind of bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test.
Background technology
During the two 12 pulse conversion valve series operation of extra-high voltage direct-current, being connected by two valve groups in each pole, is connected between extra-high voltage bus and pole neutral bus, is respectively high end valve group and low end valve group.Pole control system is divided into pole key-course and valve group key-course two levels, and the trigging control that valve group key-course realizes high end valve group and low end valve group is called group control, and pole key-course is responsible for the calculating such as pole tension instruction and electrode current instruction and closed-loop control is called that pole is controlled.
Device security during in order to ensure extra-high voltage system cloud gray model, the voltage that two 12 flutter valve groups of homopolarity series connection are born should be substantially identical.Because two 12 flutter valve groups of series connection are controlled by different valve set control systems respectively; valve group voltage is easy to produce deviation or wave; cause a valve group may run being less than 400kV; another valve group is then run being greater than under 400kV; valve group power and system voltage vibration is caused, once valve group voltage exceedes this valve group overvoltage protection action locking-valve group of valve group overvoltage protection setting value time serious.Therefore, valve group voltage balancing control seems particularly important.
Under normal released state, need to utilize electric current correction to carry out voltage balancing control between extra-high voltage direct-current system converting plant series connection bivalve group.Time no-load applied voltage test (OLT), current conversion station is defined as converting plant in pole control system, completely different when DC voltage control pattern and normal release, and when carrying out OLT, DC current is very little, electric current correction cannot be utilized to have carried out balance and control.Because the voltage fluctuation of two valve group interbus is comparatively large, if according to Control of Voltage logic during normal release, namely with the high-end 12 flutter valve group Uact=UdH-UdM of control Uact=Uref(; Low side 12 flutter valve group Uact=UdM-UdN) be target, be difficult to be directly used in stability contorting high and low end valve group both end voltage, particularly along with the rising of line voltage distribution, the voltage fluctuation of valve group interbus also can aggravate, and finally causes no-load applied voltage test to be difficult to successfully.
In order to adapt to extra-high voltage direct-current system bivalve group no-load applied voltage test needs, when current extra-high voltage direct-current system carries out OLT, with Δ U=U
dH-U
reffor control objectives, wherein U
dHfor this pole AC line voltage, U
reffor the reference voltage arranged when OLT tests.During OLT test, the group control of height end valve group is according to Δ U=U
dH-U
refcalculate this valve group Trigger Angle, the group control of low end valve group is forced to adopt the Trigger Angle identical with high end valve group, simultaneously, the low side change of current becomes tap changer gear to be forced to become with the high-end change of current to be consistent, namely, when the low side change of current becomes tap changer gear higher than high end valve group, low side change of current change sending downshift order; When the low side change of current becomes tap changer gear lower than high end valve group, low side change of current change sending upshift order, until the low end valve group change of current becomes tap changer gear and high end valve group is consistent.Become the model-following control of tap changer gear by Trigger Angle and the change of current, when making OLT, high and low end valve group voltage is completely equal, realizes voltage balancing control.
There is very large drawback in this technical scheme, namely during OLT, low end valve group group control is forced to follow high end valve component and is connect switch position and Trigger Angle, but whether the control of high end valve group group does not detect low end valve group shunting switch when carrying out Trigger Angle and tap changer gear controls is controlled, if OLT boost process low and middle-end valve group change of current variation connects switch fault, low end valve group is only followed by Trigger Angle and is changed its valve group voltage, valve group control reference voltage is very little, meanwhile, high end valve group then still can continue the desired value Δ U=U utilizing the means of adjustment tap changer gear and Trigger Angle towards no-load applied voltage test
dH-U
refadjust its voltage, this will cause high and low end valve group Voltage unbalance, and pressure reduction constantly increases, and finally cause the tripping operation of high end valve group overvoltage protection, OLT test failure.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test, be intended to solve prior art in force the group control of low end valve group to be followed technical matters that high end valve component connects the high and low end valve group Voltage unbalance that switch position and Trigger Angle cause.
Technical scheme of the present invention is as follows:
A kind of bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test, wherein, increases the cooperation control logic high and low end bivalve group change of current being become to shunting switch, is specially in pole control system:
Between low end valve group group control system communicates with the control bus of pole control system, increase a binary, this binary is " it is controlled that the low side change of current becomes shunting switch " signal, delivers to pole control system by low end valve group group control system;
Two binary are increased between high end valve group group control system communicates with the control bus of pole control system, be respectively " it is controlled that the high-end change of current becomes shunting switch " signal, pole control system is delivered to by high end valve group group control system, " OLT test time allow the high end valve group change of current become shunting switch adjustment " signal, be issued to high end valve group group control system by pole control system.
Bivalve group voltage balancing control method in described extra-high voltage direct-current transmission no-load applied voltage test, wherein, specific implementation process comprises: pole control system becomes to the high and low end valve group change of current whether shunting switch is all controlled carries out comprehensive criterion, if high and low end valve group change of current change shunting switch is all controlled, pole control system is then by the group control system transmission permission shunting switch adjustment signal of control bus to high end valve group; If it is abnormal that the high and low end change of current becomes arbitrary shunting switch, then forbid that high end valve component connects switch adjustment.
A kind of bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test, wherein, the cooperation control logic high and low end bivalve group change of current being become to shunting switch is increased in pole control system, be specially: " it is controlled that the low side change of current becomes shunting switch " signal that low end valve group group control system produces transfers to pole control system by means of only control bus, and communicated with the control bus of high end valve group group control system transfer paramount end valve group group control system by pole control system.
Bivalve group voltage balancing control method in described extra-high voltage direct-current transmission no-load applied voltage test, wherein, specific implementation process comprises: the group control system of high end valve group becomes to the high and low end valve group change of current whether shunting switch is all controlled carries out comprehensive criterion, if high and low end change of current change shunting switch is all controlled, then the group control system of high end valve group is allowed to adjust the shunting switch of its change of current change; If it is abnormal that the high and low end change of current becomes arbitrary shunting switch, then forbid that the change of current of high end valve group becomes shunting switch adjustment.
Beneficial effect of the present invention: the present invention by increasing the cooperation control logic high and low end bivalve group change of current being become to shunting switch in the group control system of pole control system or high end valve group, effectively can solve in no-load applied voltage test process the problem occurring high and low end valve group Voltage unbalance, really realize the Complete Synchronization of high and low end valve group tap changer gear and Trigger Angle, when guaranteeing that OLT tests, high and low end valve group voltage remains balance.
Accompanying drawing explanation
Fig. 1 is pole control system steering logic structural representation in the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
See Fig. 1, method provided by the invention, when carrying out OLT test, first carries out following steps:
In pole control system, increase the cooperation control logic high and low end bivalve group change of current being become to shunting switch, be specially:
Between low end valve group group control system communicates with the control bus of pole control system, increase a binary, this binary is " it is controlled that the low side change of current becomes shunting switch " signal, delivers to pole control system by low end valve group group control system;
Two binary are increased between high end valve group group control system communicates with the control bus of pole control system, be respectively " it is controlled that the high-end change of current becomes shunting switch " signal, pole control system is delivered to by high end valve group group control system, another signal is " allowing the high end valve group change of current to become shunting switch adjustment during OLT test " signal, is issued to high end valve group group control system by pole control system.
Embodiment one
After adding semaphore mentioned above and decision logic, the specific implementation process of this logic comprises:
Pole control system becomes to the high and low end valve group change of current whether shunting switch is all controlled carries out comprehensive criterion, if high and low end valve group change of current change shunting switch is all controlled, pole control system is then by the group control system transmission permission shunting switch adjustment signal of control bus to high end valve group; If it is abnormal that the high and low end change of current becomes arbitrary shunting switch, then forbid that high end valve component connects switch adjustment.
Now, the change of current of low end valve group becomes shunting switch owing to following high end valve group, therefore remain and can become the synchronous of tap changer gear with high and low end valve group Trigger Angle and the change of current, also can guarantee that high and low end valve group remains the balance of voltage in no-load applied voltage test process.
Embodiment two
The present invention also separately provides a kind of technical scheme can realize object of the present invention, and it is close with embodiment one that it controls thinking, and only implementation method is different.
The embodiment of the present invention two is when carrying out OLT test, and its specific implementation is:
" it is controlled that the low side change of current becomes shunting switch " signal that low end valve group group control system produces transfers to pole control system by means of only control bus, and to be communicated with the control bus of high end valve group group control system transfer paramount end valve group group control system by pole control system.
Detailed process is: the group control system of high end valve group becomes to the high and low end valve group change of current whether shunting switch is all controlled carries out comprehensive criterion, if high and low end change of current change shunting switch is all controlled, then the group control system of high end valve group is allowed to adjust the shunting switch of its change of current change; If it is abnormal that the high and low end change of current becomes arbitrary shunting switch, then forbid that the change of current of high end valve group becomes shunting switch adjustment.
During existing OLT test, voltage balancing control logic is that the group control system of high and low end valve group judges that whether the shunting switch of respective converter power transformer is normal voluntarily, if abnormal, then forbids the shunting switch adjustment of respective valve group.Whether the control of high end valve group group does not detect low end valve group shunting switch when carrying out extinguish angle and tap changer gear controls is controlled, if OLT boost process low and middle-end valve component connects switch fault, low end valve group only changes its valve group voltage by Trigger Angle adjustment, valve group control reference voltage is very little, meanwhile, high end valve group still can continue to utilize the means of adjustment tap changer gear and Trigger Angle to adjust its voltage towards the desired value of no-load applied voltage test, this will cause height, low end valve group Voltage unbalance, pressure reduction constantly increases, and finally cause high end valve group overvoltage protection to trip, OLT test failure.
Compare with voltage balancing control logic during existing OLT test, invention increases high and low end valve group converter power transformer shunting switch coordinated control function, the Complete Synchronization of the condition such as high and low end valve group converter power transformer shunting switch, Trigger Angle under various normal and abnormal condition can be realized, stop and the OLT test special operation condition that cause under high end valve group overvoltage tripping inconsistent due to high and low end change of current shift position.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (2)
1. a bivalve group voltage balancing control method in extra-high voltage direct-current transmission no-load applied voltage test, is characterized in that, increases the cooperation control logic high and low end bivalve group change of current being become to shunting switch, be specially in pole control system:
Between low end valve group group control system communicates with the control bus of pole control system, increase a binary, this binary is that the low side change of current becomes shunting switch controllable signal, delivers to pole control system by low end valve group group control system;
Two binary are increased between high end valve group group control system communicates with the control bus of pole control system, be respectively the high-end change of current and become shunting switch controllable signal, pole control system is delivered to by high end valve group group control system, " OLT test time allow the high end valve group change of current become shunting switch adjustment " signal, be issued to high end valve group group control system by pole control system;
Described pole control system becomes to the high and low end valve group change of current whether shunting switch is all controlled carries out comprehensive criterion, if high and low end valve group change of current change shunting switch is all controlled, pole control system is then by the group control system transmission permission shunting switch adjustment signal of control bus to high end valve group; If it is abnormal that the high and low end change of current becomes arbitrary shunting switch, then forbid that high end valve component connects switch adjustment.
2. bivalve group voltage balancing control method in an extra-high voltage direct-current transmission no-load applied voltage test, it is characterized in that, the cooperation control logic high and low end bivalve group change of current being become to shunting switch is increased in pole control system, be specially: " it is controlled that the low side change of current becomes shunting switch " signal that low end valve group group control system produces transfers to pole control system by means of only control bus, and communicated with the control bus of high end valve group group control system transfer paramount end valve group group control system by pole control system; The group control system of described high end valve group becomes to the high and low end valve group change of current whether shunting switch all controlled carries out comprehensive criterion, if the high and low end change of current to become shunting switch all controlled, then the shunting switch allowing the group control system of high end valve group to adjust its change of current to become; If it is abnormal that the high and low end change of current becomes arbitrary shunting switch, then forbid that the change of current of high end valve group becomes shunting switch adjustment.
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| CN112968459B (en) * | 2021-02-05 | 2023-05-23 | 国网山西省电力公司检修分公司 | Tap control method based on homopolar converter transformer tap fixed deviation alternating control |
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| JP5062994B2 (en) * | 2005-12-07 | 2012-10-31 | 株式会社エヌエフ回路設計ブロック | Element testing equipment |
| CN101383509B (en) * | 2008-10-17 | 2010-06-02 | 南方电网技术研究中心 | Extra-high voltage DC power transmission control system configuring method |
| CN101814732B (en) * | 2009-12-02 | 2012-02-29 | 南京南瑞继保电气有限公司 | Double 12-pulse valve bank coordinated-control method for ultra-high voltage direct-current transmission system |
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